Luckily Guinan not remembering Picard from "Times Arrow" in PICARD season 2 (plus Simon Pegg's assertion the Kelvin timeline could diverge pre 2233) gives a good out from this not having to be taken as canon to the original timeline.Depending on how many decades earlier, it can easily be prime as well, before the Nero-Kelvin split
And if it says Khan was the 21st century that would help just as well!